Mongoose CastError Cast to ObjectId failed for value object Object at path id

Question

I am new to node js  so I have a feeling that this will be something silly that I have overlooked  but I haven t been able to find an answer that fixes my problem  What I m trying to do is create a path that will create a new child object  add it to the parent s array of children  then return the child object to the requester  The problem that I am running into is that if I pass the string id into findById  node crashes with     TypeError  Object    has no method  cast    If I try to pass in an ObjectId instead  I get     CastError  Cast to ObjectId failed for value   object Object   at path   id    Here is a rough outline of my code   var mongoose   require  mongoose    var Schema   mongoose Schema  var ObjectId   Schema ObjectId    Have also tried Schema Types ObjectId  mongoose ObjectId  mongoose connect  mongodb   user password server port database     app get   myClass  Id childClass create   function request  result      var id   new ObjectId request params Id     MyClass findById id  exec  function err  myClass        if  err     myClass    result send  error      err     lt br gt     JSON stringify id       object      request params Id      not found      id    return        var child   ChildClass        myClass Children addToSet child       myClass save        result send child               If I execute this code with the path   myClass 51c35e5ced18cb901d000001 childClass create   this is the output of the code      error  CastError  Cast to ObjectId failed for value   object Object   at path   id      path   51c35e5ced18cb901d000001   instance   ObjectID   validators      setters      getters       index  null    I ve tried using findOne and passing in   id id  instead  but this appears to be exactly what findById does  I ve tried the different classes for ObjectId that I ve seen listed on other sites  I ve tried calling ObjectId   like a function instead of a constructor and that returns undefined  At this point  I m running out of ideas and it doesn t seem that googling for an answer is helping  Any ideas on what I m doing wrong   Also  like I said  I m new to node Mongo Mongoose Express  so if there is a better way to accomplish my goal  please let me know  I appreciate all feedback   EDIT   After the workaround from Peter Lyons  I googled another error that I was running into and found findByIdAndUpdate  which works as expected and does exactly what I was hoping to do  I m still not sure why findById and findOne were giving me such issues and I m curious to know  maybe a bug report needs to be filed   so I ll leave this open in case someone else has an answer

User · Answer

I was receiving this error  CastError  Cast to ObjectId failed for value     object Object     at path     id    after creating a schema  then modifying it and couldn t track it down  I deleted all the documents in the collection and I could add 1 object but not a second  I ended up deleting the collection in Mongo and that worked as Mongoose recreated the collection

User · Answer

I had the same problem  turned out after I have updated my schema  I have forgotten I was calling the model using the old id  which was created by me  I have updated my schema from something like   patientid               type  String              required  true              unique  true                 to   patientid    type  mongoose SchemaTypes ObjectId  ref   Patient       It turned out  since my code is big  I was calling the findOne with the old id  therefore  the problem    I am posting here just to help somebody else  please  check your code for unknown wrong calls  it may be the problem  and it can save your huge headacles

User · Answer

Short answer  use mongoose Types ObjectId   Mongoose  but not mongo  can accept object Ids as strings and  cast  them properly for you  so just use   MyClass findById req params id    However  the caveat is if req params id is not a valid format for a mongo ID string  that will throw an exception which you must catch   So the main confusing thing to understand is that mongoose SchemaTypes has stuff you only use when defining mongoose schemas  and mongoose Types has the stuff you use when creating data objects you want to store in the database or query objects  So mongoose Types ObjectId  51bb793aca2ab77a3200000d   works  will give you an object you can store in the database or use in queries  and will throw an exception if given an invalid ID string   findOne takes a query object and passes a single model instance to the callback  And findById is literally a wrapper of findOne   id  id    see source code here   Just find takes a query object and passes an array of matching model instances to the callback   Just go slow  It s confusing but I can guarantee you you are getting confused and not hitting bugs in mongoose at this point  It s a pretty mature library  but it takes some time to get the hang of it   The other suspect thing I see in your snippet is not using new when instantiating ChildClass  Beyond that  you ll need to post your schema code in order for us to help you tract down any CastErrors that remain

User · Answer

For the record  I had this error trying to fill a subdocument in a wrong way      CastError  Cast to ObjectId failed for value   object Object   at path   id   message   Cast to ObjectId failed for value   object Object   at path   id    name   CastError   type   ObjectId   path    id  value        timestamp   2014-07-03T00 23 45-04 00     date start   2014-07-03T00 23 45-04 00     date end   2014-07-03T00 23 45-04 00     operation   Deactivation           look   value is an array containing an object  wrong   Explanation  I was sending data from php to a node js API in this way    history   json encode  array    array     timestamp     gt  date  c   time        date start    gt  date  c   time        date end      gt  date  c   time        operation     gt   Deactivation         As you can see  history is an array containing an array  That s why mongoose try to fill  id  or any other field  with an array instead than a Scheme ObjectId  or any other data type   The following works    history   json encode  array     timestamp     gt  date  c   time        date start    gt  date  c   time        date end      gt  date  c   time        operation     gt   Deactivation

User · Answer

If you are having this issue and you are performing a populate somewhere along the lines  see this Mongoose issue   Update to Mongoose 4 0 and the issue has been fixed

User · Answer

I am not sure this will help but I resolved the issue by importing mongoose like below and implementing it as below const mongoose   require  mongoose     id  new mongoose Types ObjectId

User · Answer

For all those people stuck with this problem  but still couldn t solve it  I stumbled upon the same error and found the  id field being empty   I described it here in more detail  Still have not found a solution except changing the fields in  id to not-ID fields which is a dirty hack to me  I m probably going to file a bug report for mongoose  Any help would be appreciated   Edit  I updated my thread  I filed a ticket and they confirmed the missing  id problem  It is going to be fixed in the 4 x x version which has a release candidate available right now  The rc is not recommended for productive use

User · Answer

Had the same problem  I just coerced the id into a string   My schema   const product   new mongooseClient Schema       retailerID    type  mongoose SchemaTypes ObjectId  required  true  index  true         And then  when inserting   retailerID     retailer  id

User · Answer

I ve faced this error  That was because the value you want to filter in the  id field is not in an ID format  one  if  should solve your error   const mongoose   require  mongoose     console log mongoose Types ObjectId isValid  53cb6b9b4f4ddef1ad47f943        true console log mongoose Types ObjectId isValid  whatever        false   To solve it  always validate if the criteria value for search is a valid ObjectId  const criteria       criteria  or        if params q      if mongoose Types ObjectId isValid params id         criteria  or push    id  params q          criteria  or push   name     regex  params q   options   i        criteria  or push   email     regex  params q   options   i        criteria  or push   password     regex  params q   options   i         return UserModule find criteria  exec      gt         do stuff

User · Answer

just change the path it will work for example   app get   myClass  Id childClass create   function request  result          change to   app get   myClass  es    Id childClass create   function request  result          I just added --es-- to the path  myClass  to become  myClasses   now should work and will not see that error

User · Answer

I was having the same problem Turns out my Node js was outdated  After upgrading it s working

User · Answer

My solution is that i want data from all docs and i dont want  id  so  User find       id 0  keyToShow 1  keyToNotShow 0

User · Answer

I also encountered this mongoose error CastError  Cast to ObjectId failed for value   583fe2c488cf652d4c6b45d1   at path     id   for model User  So I run npm list command to verify the mongodb and mongoose version in my local  Heres the report                 -- mongodb 2 2 19  -- mongoose 4 7 2           It seems there s an issue on this mongodb version so what I did is I uninstall and try to use different version such as 2 2 16    npm uninstall mongodb  it will delete the mongodb from your node modules directory  After that install the lower version of mongodb    npm install mongodb 2 2 16 Finally  I restart the app and the CastError is gone

[node.js] Mongoose: CastError: Cast to ObjectId failed for value "[object Object]" at path "_id"

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